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Product Introduction ：

The crane limit switch is a safety device which including traveling limit switch and load limit switch. Traveling limit switch used both on crane and hoist or trolley. Load limit switch used on hoist and trolley.Traveling limit switch control the travel of the working machine, while the limit switch control the position of the working machine, and often the terminal position or limit position.

Overhead cranes are used for heavy, repetitive lifting in Marine and Mining environments where conditions are harsh for operators and equipment. Limit switches play many roles in the operation of overhead cranes, including being a critical safety measure.

A heavy duty limit switch is used for position indication and over travel protection in harsh and abrasive environments. Robust features such as die-cast housing, heavy duty mechanisms, and industrial grade contacts allow a heavy duty limit switch to withstａnd hazardous applications with a long mechanical life.

There are types of heavy duty limit switches that help prevent the hoist from overtravel and some that help protect the crane motor from overheating. It is common to have more than one limit switch on single crane operation. While one switch can indicate that the crane is close to reaching the safe travel limit, another switch can indicate when the safe travel limit is reached and stops the crane from further movement. Heavy duty limit switches are essential components to providing a safe environment in overhead crane applications.

Technical parameters:

●Product model: MA 471-0202Y;

●Ui:550V;

●Uimp:6KV;

●IP Grade: IP65

●Shell material:Cast aluminum alloy housing

Operating principle：

The displacement signal synchronized between the heavy duty limit switch and the controlled mechanism is connected with the input shaft of the limiter after the external hanging wheel speed change and converted into the angular displacement signal of the output shaft by the speed change of the reducer.

Application:

·Construction, port, mining and other industries of lifting

·transmission machinery space three coordinate control and limit

·Two way deceleration (or alarm) and limit of crane.

·Over lift and over low (or over high) limit and protection.

·It is suitable for the control and lifting limit of double beam crane, gantry crane and winch.

·Injection molding machine. 

·It is used to detect the position of drive units and also industrial devices & equipment.

·These switches are used in machine tools like metal fabrication devices, transfer lines, presses, etc.

·These types of switches are used in material handling equipment like elevators, conveyors, hoists, and cranes.

·These are used in textile machinery, process equipment, and packaging machinery.

·These are applicable in lift trucks, vehicles, equipment, construction machinery, etc.

·These switches are used in control cabinets and garage doors

Advantages:

·Durably designed to offer easy and quick installation in different environments

·Excellent operating characteristics alongside good environmental resistances

·Comes equipped with good spatter resistance features

·It has high precision, accuracy, and repeatability.

·Limit switch is cheaper in comparison to proximity or photoelectric switch.

·It can withstａnd the toughest environmental conditions.

·It can be used in almost any industrial environment.

·It consumes little electrical energy.

·It can control multiple loads.

·It has a compact size.

·It is easy to install.

·The switch housing may be made from aluminum or plastic material, but in all cases, it protects the internal mechanism with superior electrical insulation and mechanical strength.

·Immune to electromagnetic interference.

·Mechanical durability up to approx.